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Back-up ring

Standard Back Up Ring
Used primarily as an anti-extrusion device, standard back-up rings are used in both static and dynamic sealing. Made of materials that are resistant to pressure induced flow, the back-up ring keeps a seal from extruding into the clearance gap between mating parts.
Contoured Back-Up Rings
Contoured back-up rings are anti-extrusion devices, used in both static and dynamic sealing environments; they are also useful when mating part clearances are not tightly controlled. In either case they can extend the useful lfe of O-rings. Contoured back-up rings have a slightly concave face on one side, enabling uniform contact with the entire diameter of the O-rings they are used with. Sizes correspond with AS568 O-rings. Whenever possible, the use of two back-up rings is recommended, even in single-acting applications.